On Sunday, Aug. 27, a “rally against hate” was scheduled in Berkeley, California, by a small group of relatively conservative Christians, led by Amber Cummings, a transgender Trump supporter and a leader of a group called Patriot Prayer, and a Japanese-American named Joey Gibson. Their event never took place. The left-wing group known as antifa, a contraction of “anti-fascist,” showed up in large numbers. Videos shows its members pouncing on one of the rally supporters, knocking him to the ground, and preparing to beat him with sticks and rocks. The Washington Post reported: “A pepper-spray-wielding Trump supporter was smacked to...